magic_proxy.rb

class CodeWriter
  VALID_OPTIONS = %w[
    q
    r
    s
    t
    u
    v
    w
    x
    y
    z
  ]

  attr_accessor :output, :opts

  def initialize(output, opts={})
    @opts = opts
    @output = output
  end

  VALID_OPTIONS.each do |opt_name|
    define_method(opt_name) do |*args|
      if args.any?
        opts[opt_name] = args
      else
        opts[opt_name] = !opts[opt_name]
      end
      self
    end
  end

  def to_s
    [output, opts]
  end

end

if $0 == __FILE__
  p CodeWriter.new("thingy").x.y(5).z.to_s
end